I've had issues with Ams and muzzy carbons both. They have their place, especially those guys shooting compounds at high poundage. They need the spine of a carbon. But you have to baby them. Glancing blows are worse than straight on. The only one worth a darn is the Muzzy mag. But it only comes in a larger diameter shaft do tips are limited. Plus cha ching. Yellow jackets are only $6 per shaft and last 10 times as long.